Yes Tom it is a drawbore pin so you get a point for that answer but I should have asked for a description of it... For those who don't know what it is:

Without the benefit of scale you could be forgiven for thinking this is just another awl. But at a shade over 420mm (16 in) long and a shaft diameter of 12.7mm (1/2 inch) at its thickest this is no lightweight marking tool. Used mainly in joinery (in the English sense) and outdoor carpentry this monster of a hand tool is intended for the heaver side of wood jointing.

It is used for ‘drawing’ the shoulders of a tenon tight up against the mortised piece of a mortise and tenon joint. This is usually a through joint where the tongue of the tenon is cut deliberately long. The joint is fitted together and the point at where the tenon emerges from the mortise a line is marked. The joint is then disassembled and a 12.7mm (1/2 in) hole is bored through it. The further back over the line the hole is bored the tighter the Drawbore pin will pull the joint closed. The joint is reassembled and the pin forced through the hole as far as hand pressure will allow.

The joint is now being held together by the drawbore pin. A hole is now made through the walls of the mortise and the tongue of the tenon, into which a securing dowel is driven The drawbore pin is removed and the protruding length of tenon sawn off. This sort of joinery is useful where shrinkage of the wood is to be expected.

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